table_options signifies table options of the kind that can be used in the CREATE TABLE statement, such as ENGINE, AUTO_INCREMENT, AVG_ROW_LENGTH, MAX_ROWS, ROW_FORMAT, or TABLESPACE.. For descriptions of all table options, see Section 13.1.20, “CREATE TABLE Statement”.However, ALTER TABLE ignores DATA DIRECTORY and INDEX DIRECTORY when given as table …

July 03, 2009 02:41AM Re: Altering Table to Add column very slow. You change a column size or type in MySQL using the ALTER TABLE and MODIFY commands together to make the change. MySQL performs most alterations by making an empty table with the desired new structure, inserting all the data from the old table into the new one, and deleting the old table. 11504. 1.

When you execute RENAME, you cannot have any locked tables or active transactions. 5590. On the smaller server, where ALTER TABLE was faster, the relevant PMM monitoring plots show: In our Percona Server version 5.7, ALTER TABLE helios ADD COLUMN. To disable logging so that you can alter (or drop) a log table, you can use the following strategy. If using 5.6+, renames and adding/removing indices are performed online, i.e. Rick James. Usually one would expect that ALTER TABLE with ALGORITHM=COPY will be slower than the default ALGORITHM=INPLACE. Let's say, for example, that you have a column named "State" on a table named "Address" and you previously set it up to hold two characters, expecting people …

Very slow query on table with Blob column [closed] Ask Question ... -- AUTO_INCREMENT for table `tblphotos` -- ALTER TABLE `tblphotos` MODIFY `PhotoID` int(10) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=3421; ... from MySQL view (2x INNER JOIN) is slow. Your ALTER TABLE statement implies mysql will have to re-write every single row of the table including the new column. The ALTER TABLE involves copying over all the data from the table and recreating the indexes. CREATE FULLTEXT INDEX is the only exception. The example uses the general query log; the procedure for the slow query log is similar but uses the slow_log table and slow_query_log system variable.
5603. 11459. Your table has 15 million rows, which is something. The correct answer depends on the version of the MySQL engine you're using. Table Options. Altering Table to Add column very slow. Yes, testcase can be reduced for slow duration; mysql> CREATE TABLE t1(c1 INT,c2 CHAR,UNIQUE KEY(c1)) ENGINE=MyISAM PARTITION BY LINEAR KEY(c1) PARTITIONS 99; Query OK, 0 rows affected (0.04 sec) mysql> ALTER TABLE t1 ENGINE=InnoDB; Query OK, 0 rows affected (7.77 sec) Records: 0 Duplicates: 0 Warnings: 0 There is also query difference. MySQL’s ALTER TABLE performance can become a problem with very large tables. Abraham Alex. The index creation is single-threaded. query using Percona Monitoring and Management (PMM) to record and review performance. ALTER TABLE helios ADD COLUMN. Altering Table to Add column very slow.

without copying all the table's data.. Just use ALTER TABLE as usual, it'll be mostly instant for renames and index drops, and reasonably fast for index addition (as fast as reading all the table once).
Bug #93530: ALTER TABLE DROP INDEX is very slow: Submitted: 8 Dec 2018 20:23: Modified: 29 Jan 2019 6:13: Reporter: monty solomon: Email Updates: If this is an online operation (like it is by default), the table can be read and written concurrently while ha_innobase::inplace_alter_table is executing. Rick James. However when I ran the Alter command on the large database where the table had over 20 million rows, it is been running for over 6 hours and still continuing. was executed in place. Since you have more than 2 million rows, I would definitely expect it takes a significant amount of time, during which your server will likely be mostly IO-bound.

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